Relays bridge the gap, making it possible for small currents to activate larger ones. That means relays can work either as switches (turning things on and off) or as amplifiers (converting small currents into larger ones).Artwork: If relays were dogs: Suppose you had a huge, ferocious dog ...
In an extremely simple circuit, you would wire a CdS cell directly to a relay (see How Relays Work), so that a lot of light would energize the electromagnet and a small amount of light would not. Usually, however, a CdS cell cannot draw enough current to activate the relay when light...
To understand the problem, it is helpful to understand something about voltage. Voltage is a measure of a difference in electric potential energy. Electric current travels from point to point because there is a greater electric potential energy on one end of the wire than there is on the other...
Wires can connect two terminals together, or they can connect dozens. When a wire splits into two directions, it creates a junction. We represent junctions on schematics with nodes, little dots placed at the intersection of the wires. Nodes give us a way to say that "wires crossing this ...
Shop the huge selection oflive sound power amplifiers at Musician’s Friend. Live Sound Mixers Electronic signals from microphones and instruments need to be balanced, processed and mixed together before they can be amplified and routed to PA speakers and monitors. In your live music PA, this is...
cables is surrounded by copper wire (the ground). Strip the red and green cables back so you have about a half inch to an inch of clean and shiny bare wire. Keep the red and green wires separate, but twist the two sets of copper wire together—so you have three wires instead of ...
When it comes to wire markings, the wire attached to the negative terminal will normally have some form of a stripe, whilst the one without a mark is for the positive terminal. You can also remember which is positive and which is negative with color coding. The most prevalent color coding...
While the terminals on the back of stereo equipment tend to be easily identified, the same cannot be said for speaker wires. This is often where confusion can occur because the labeling isn't always obvious. If a speaker wire doesn't have a two-tone color scheme, look for a single strip...
Today, we face a wall's worth of tuners, amplifiers, game consoles, DVRs, VCRs, DVDs, Blu-rays and moribund VHS machines, to say nothing of the cassette player you keep moving but probably haven't even bothered to hook up. What are all those jacks for, anyway? Just as you wouldn'...
If you're building a new home, you might want to consider running all the speaker wires back to one central "machine room" which will might save time whenever you need to install or adjust the amplifiers. Then again, if you're installing new speakers, instead of running speaker wire all...